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//
// detail/service_registry.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_ASIO_DETAIL_SERVICE_REGISTRY_HPP
#define BOOST_ASIO_DETAIL_SERVICE_REGISTRY_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <typeinfo>
#include <boost/asio/detail/mutex.hpp>
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/io_service.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename T>
class typeid_wrapper {};
class service_registry
: private noncopyable
{
public:
// Constructor. Adds the initial service.
template <typename Service, typename Arg>
service_registry(boost::asio::io_service& o,
Service* initial_service, Arg arg);
// Destructor.
BOOST_ASIO_DECL ~service_registry();
// Notify all services of a fork event.
BOOST_ASIO_DECL void notify_fork(boost::asio::io_service::fork_event fork_ev);
// Get the first service object cast to the specified type. Called during
// io_service construction and so performs no locking or type checking.
template <typename Service>
Service& first_service();
// Get the service object corresponding to the specified service type. Will
// create a new service object automatically if no such object already
// exists. Ownership of the service object is not transferred to the caller.
template <typename Service>
Service& use_service();
// Add a service object. Throws on error, in which case ownership of the
// object is retained by the caller.
template <typename Service>
void add_service(Service* new_service);
// Check whether a service object of the specified type already exists.
template <typename Service>
bool has_service() const;
private:
// Initialise a service's key based on its id.
BOOST_ASIO_DECL static void init_key(
boost::asio::io_service::service::key& key,
const boost::asio::io_service::id& id);
#if !defined(BOOST_ASIO_NO_TYPEID)
// Initialise a service's key based on its id.
template <typename Service>
static void init_key(boost::asio::io_service::service::key& key,
const boost::asio::detail::service_id<Service>& /*id*/);
#endif // !defined(BOOST_ASIO_NO_TYPEID)
// Check if a service matches the given id.
BOOST_ASIO_DECL static bool keys_match(
const boost::asio::io_service::service::key& key1,
const boost::asio::io_service::service::key& key2);
// The type of a factory function used for creating a service instance.
typedef boost::asio::io_service::service*
(*factory_type)(boost::asio::io_service&);
// Factory function for creating a service instance.
template <typename Service>
static boost::asio::io_service::service* create(
boost::asio::io_service& owner);
// Destroy a service instance.
BOOST_ASIO_DECL static void destroy(
boost::asio::io_service::service* service);
// Helper class to manage service pointers.
struct auto_service_ptr;
friend struct auto_service_ptr;
struct auto_service_ptr
{
boost::asio::io_service::service* ptr_;
~auto_service_ptr() { destroy(ptr_); }
};
// Get the service object corresponding to the specified service key. Will
// create a new service object automatically if no such object already
// exists. Ownership of the service object is not transferred to the caller.
BOOST_ASIO_DECL boost::asio::io_service::service* do_use_service(
const boost::asio::io_service::service::key& key,
factory_type factory);
// Add a service object. Throws on error, in which case ownership of the
// object is retained by the caller.
BOOST_ASIO_DECL void do_add_service(
const boost::asio::io_service::service::key& key,
boost::asio::io_service::service* new_service);
// Check whether a service object with the specified key already exists.
BOOST_ASIO_DECL bool do_has_service(
const boost::asio::io_service::service::key& key) const;
// Mutex to protect access to internal data.
mutable boost::asio::detail::mutex mutex_;
// The owner of this service registry and the services it contains.
boost::asio::io_service& owner_;
// The first service in the list of contained services.
boost::asio::io_service::service* first_service_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#include <boost/asio/detail/impl/service_registry.hpp>
#if defined(BOOST_ASIO_HEADER_ONLY)
# include <boost/asio/detail/impl/service_registry.ipp>
#endif // defined(BOOST_ASIO_HEADER_ONLY)
#endif // BOOST_ASIO_DETAIL_SERVICE_REGISTRY_HPP
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